Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Qual é a maior massa para a Cratera Tycho?
 ###Tabelas: CREATE TABLE 2005–present (2005–present_id AUTO_INCREMENT PRIMARY KEY, Season INT, Player VARCHAR, Club VARCHAR, Goals INT, Games INT, Rate INT) CREATE TABLE technical_specifications (technical_specifications_id AUTO_INCREMENT PRIMARY KEY, Model Type VARCHAR, Model Designation VARCHAR, Engine VARCHAR, Wheelbase (mm/inch) VARCHAR, GVW (kg/ton) VARCHAR, Axle Ratio VARCHAR) CREATE TABLE most_assists (most_assists_id AUTO_INCREMENT PRIMARY KEY, Name VARCHAR, Years VARCHAR, MLS Cup INT, U.S. Open Cup INT, CONCACAF INT, Other INT, Total INT) CREATE TABLE u.s._unmanned_soft_landings_1966–1968 (u.s._unmanned_soft_landings_1966–1968_id AUTO_INCREMENT PRIMARY KEY, U.S. mission VARCHAR, Mass (kg) INT, Booster VARCHAR, Launched VARCHAR, Mission goal VARCHAR, Landing zone VARCHAR, Lat / Lon VARCHAR) CREATE TABLE prize_money_won (prize_money_won_id AUTO_INCREMENT PRIMARY KEY, Player VARCHAR, Group Legs won INT, Play-Off Legs won INT, Winners Group Legs won INT, Winners Play-Off Legs won INT, Final position money won* VARCHAR, Total money won VARCHAR)  
SELECT MAX Mass (kg) FROM u.s._unmanned_soft_landings_1966–1968 WHERE Landing zone = tycho crater